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W. V. TURNER.

ELECTHOPNEUMATIC BRAKE. APPLICATION man APR. 2. |911.

Patented Oct. 7, 1919.

'Q no 0') l n 'Q nn [N Q `Q on Q @n Ix INVENTOF! Wolfe PV Emme r` W WMM? WALTER V. TURNER, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR T0 THE WEST- ING-HOUSE AIR BRAKE COMPANY, 0F WILMERDING, PENNSYLVANIA, A CORPO- RATION 0F PENNSYLVANIA.

ELECTROPNEUMATIC BRAKE.

Specification of Letters Patent.

. vPatented Oct. '7, 1919.

To all whom it muy concern.'

Be it known that I, WALTER V. TURNER, a citizen oit' the United States, residing at lVilkinsburg, in the county of lAllegheny and State of Pennsylvania, have Yinvented new and useful Improvements in Electropneumatie Brakes, 'of which the following is a specification.

j rThis invention relates to electro-pneumatic brakes as employed on railway vehicles.

In electro-pneumatic brakeequipmeuts, it has heretofore been proposed to employ an application magnet and a release magnet with a separate transmission wire for each 'magnet Y The principal object of my invention is to provide an electro-pneumatic brake system in which the application and release magnets may be separately controlled through a common transmission line, thus dispensing with one of the train wires heretofore' required.

In the accompanying drawing; I*`igure 1 is asectional View of an electro-pneumatic brake equipment for a car andembodying my invention; Fig. 2 a wiring diagram,

` causes the movement oi' the triplevalvepistonV 9, Iirst shifting the graduating valve 12 to uncover po-rt 23 and then Vmoving the main showing one method oie/connecting up the application and the release magnets; and Fig. 3 a wiring diagram, showing another method of connecting up the application and release magnets.

As shown in Fig. 1 of the drawing, the electro-pneumatic brake equipment may comprise a triple valve device 1, having a magnet bracket 2 secured to the face of the 'triple valve casing and `connected bythe respective pipes 3 anda to an auxiliary reservoir 5 and a brake cylinder 6.

The triple valve device 1 may comprise the usualcasng, having'a piston chamber 7 connected to lbrake pipe 8 and containing piston 9 and having valve chamber 10 connected to auxiliary reservoir 5 and containing a main slide valve 11 and a graduating slide valve 12, mounted on the main slideV valve and having a movement relative thereto.

On the magnet bracket 2 there is p-ro-vided a release magnet 13 for operating a brake cylinder release valve. 14 and an application magnet 15 for operating a valve 16 for venting fluid from the piston chamber 7 and the brake pipe 8 to the brake cylinder.

One terminal of each application and remission line, if it is desired to effect an electric application of the brakes,a voltage is impressed on the transmission line 18 suf-- icient to effect the operation of both the application magnet 15and the release magnet 13. The energization of the application lmagnet 15 causes the Valve 16 to open, so

that fluid is vented rom'piston chamber 7, through passage 19 to passage 20,`and thence past the non-return check valve 21 to brake `cylinder passage 22 and brake cylinder 6..

The reduction 'in pressure thusfproduce'd slide valvev 1l, so that the port 23 registers Nvith passage 22. Fluid is then supplied It the rate of vreduction in pressure inpiston chamber 7 should exceed the' desired service rate, the piston 9 will move out and close or restrict the passage 19, so as to cut kott or reduce the venting of iiuid fromthe pistonV chamber.

The brakes may be fully released byvdenergizing the application and release magnets and by increasing the brake pipe pressure to ellect the movement of the triple valve' piston to release position, in which the fluid in the brake cylinder is released through the passage 22, cavity 24 in the main slide valve 11, and passage 25 to exhaust port QG.

It it is desired to hold the brakes applied and recharge the auxiliary reservoirs 5 throughout the train, a voltage is impressed on the transmission line which is sufficient to energize the release magnets with such force as to operate the release valves 14C to close the brake cylinder exhaust while in- Veo Qciple of my invention.

-magnet may also be utilized to secure a simultaneous release ofthe brakes throughout'the train, by iirst manipulating the brake valve to eliect an increase in brake pipe pressure and then after all the triple valve deyices have been returned to release v,position thereby, the release magnetscan taneous release of fluid from the brake cylinbe separately operated to effect the simulders throughout the train.

rlhe application'and the release magnets yshown in Fig. 1 of thedrawingare convv2,.-but they may be connected up as shown lin Fig. 3 of the drawing, if desired.

nected to the train wires as shown in Fig.

' The voltage on the transmission line gradually decreases from the vfront to the rear of the train, so that to insure operation Vwhen desired each set of magnets must be vdesigned to operate through a range in v voltage such that the operation of all the magnets of a lgiven set will be assured, and forthis reason, a voltage range 1s provided for each set of magnets, but the maximum voltagefrequired to operate one set of magnets', such as the release magnets must be .less than the minimum voltage at which the application `magnets will operate, so that I thevk separate operation `oi" one set of magnets can be secured', inv accordance with the prin.'

Having now described my invention, what IV claim as new andfdesire to secure by Letters Patent, is:

1. In an electro-pneumatic brake, the

-.combination with a iuid pressure brake, of

magnets forl controlling said brake, one magnet being adapted to operate 'at a voltage lessthan the minimum voltage at which another magnet will operate.

v. 2. In lan electro-pneumatic brake, the

combination with Aa fluid pressure brake, of

A Cppeg of this patent may be obtainedfor five cents Veach, by addressing the Commissioner of two magnets for controlling said brake, one of which is adapted to operate at a voltage less than the minimum voltage at which the other magnet will operate.

K thereto.

V5. an electro-pneumatic brake, the combination with a Huid pressure brake, of an electric supply train wire and a return train wire forming an electric circuit and.

an application and a release magnet for conl trolling said brake and connected directly to said train wires.

6. In an electro-pneumatic brake, the

combination with a iuid pressure brake, of

an application and a release magnet for controlling said brake and arranged in the same electric circuit, the release magnet being adapted to operate at a voltage less than `the minimum voltage required to operate the application magnet.

7. In an electro-pneumatic brake, the combination with a uid pressure brake, of an application and a release magnet for .controlling said brake and arranged in the 'same electric circuit, the release magnets and the application magnets being so wound that theleast voltage which will be effective vto operate the applicationmagnets will be greater than the maximum voltage employed to operate the release magnets. n

8. In an electro-pneumatic brake, the

[combination vwith a iuid pressure brake, of

an application and a release magnet for controlling' said brakes, an electric ysupply wire directly connected to one of the termiiials of each magnet, and a' return wire directly connected to the other terminals of Asaid magnets. Y. In testimony whereof I hereunto set my hand.

WALTER V. TURNER.

Washington, D. C.

Patents. 

